Light-emitting device for generating a specific light pattern and light-guiding unit thereof

Abstract

A light-emitting device for generating a specific light pattern and a light-guiding unit thereof are disclosed. The light-guiding unit includes a light-guiding plate, a reflective layer having a first predetermined reflectance disposed between the light-guiding plate and the bridge support, a patterned light-guiding microstructure with a predetermined pattern having a second predetermined reflectance disposed between the light-guiding plate and the reflective layer, and a light uniform microstructure disposed on the light-guiding plate and correspondingly opposite to the patterned light-guiding microstructure, and the first predetermined reflectance of the reflective layer is different from the second predetermined reflectance of the patterned light-guiding microstructure. Therefore, initial light beams generated by the two light-emitting modules are reflected by the patterned light-guiding microstructure to form a projection light source with the specific light pattern passing through the light uniform microstructure.

What is claimed is: 
     
         1 . A light-emitting device for generating a specific light pattern, comprising:
 a heat-dissipating unit including two heat-dissipating structures separated from each other by a predetermined distance;   a light-emitting unit including two light-emitting modules respectively detachably disposed on the two heat-dissipating structures;   a support unit including a bridge support detachably disposed between the two heat-dissipating structures, wherein the bridge support has a retaining groove disposed on a bottom side thereof; and   a light-guiding unit detachably disposed inside the retaining groove of the bridge support, wherein the light-guiding unit includes a light-guiding plate, a reflective layer having a first predetermined reflectance disposed between the light-guiding plate and the bridge support, a patterned light-guiding microstructure with a predetermined pattern having a second predetermined reflectance disposed between the light-guiding plate and the reflective layer, and a light uniform microstructure disposed on the light-guiding plate and correspondingly opposite to the patterned light-guiding microstructure, and the first predetermined reflectance of the reflective layer is different from the second predetermined reflectance of the patterned light-guiding microstructure;   wherein initial light beams generated by the two light-emitting modules are reflected by the patterned light-guiding microstructure to form a projection light source with the specific light pattern passing through the light uniform microstructure.   
     
     
         2 . The light-emitting device of  claim 1 , wherein each heat-dissipating structure includes a top heat-dissipating unit, a bottom heat-dissipating unit opposite to the top heat-dissipating unit, an outside heat-dissipating unit connected between the top heat-dissipating unit and the bottom heat-dissipating unit, and an inside heat-dissipating unit opposite to the outside heat-dissipating unit, wherein the top heat-dissipating unit has a plurality of top heat-dissipating fins extended upwardly from the heat-dissipating structure, the bottom heat-dissipating unit has a plurality of bottom heat-dissipating fins extended downwardly from the heat-dissipating structure, the outside heat-dissipating unit has a plurality of outside heat-dissipating fins extended outwardly from the heat-dissipating structure, and the inside heat-dissipating unit has a plurality of inside heat-dissipating fins extended inwardly from the heat-dissipating structure. 
     
     
         3 . The light-emitting device of  claim 2 , wherein each heat-dissipating structure has a receiving space among the top heat-dissipating unit, the bottom heat-dissipating unit, the outside heat-dissipating unit, and the inside heat-dissipating unit, and each light-emitting module includes a circuit substrate detachably disposed inside the receiving space to directly contact the corresponding heat-dissipating structure and a plurality of light-emitting diodes disposed on the circuit substrate and electrically connected to the circuit substrate. 
     
     
         4 . The light-emitting device of  claim 3 , further comprising: a light-shading unit including two light-shading covers respectively disposed on the two heat-dissipating structures to respectively cover the two light-emitting modules, wherein each circuit substrate is positioned on the corresponding heat-dissipating structure through a plurality of first securing members, two opposite end portions of the bridge support are respectively positioned on the two heat-dissipating structures through a plurality of second securing members, and each light-shading cover is positioned on the corresponding heat-dissipating structure through a plurality of third securing members to cover the light-emitting diodes of the corresponding light-emitting module. 
     
     
         5 . The light-emitting device of  claim 1 , wherein the light-guiding plate has two light input surfaces respectively facing the two light-emitting modules, a reflective surface connected between the two light input surfaces and facing the bridge support, and a light output surface opposite to the reflective surface, and the patterned light-guiding microstructure has a plurality of microgrooves parallel to the two light input surfaces or a plurality of quadrangular pyramids arranged as a matrix, wherein the bridge support has two hook portions respectively extended downwardly from two opposite long lateral sides thereof, and two opposite long lateral sides of the light-guiding unit are respectively retained inside the two hook portions of the bridge support. 
     
     
         6 . The light-emitting device of  claim 5 , wherein the patterned light-guiding microstructure with the predetermined pattern is integrally disposed on the reflective surface of the light-guiding plate, the reflective layer is attached to the reflective surface to cover the patterned light-guiding microstructure, and the light uniform microstructure is disposed on the light output surface of the light-guiding plate. 
     
     
         7 . The light-emitting device of  claim 5 , wherein the patterned light-guiding microstructure with the predetermined pattern is prefabricated on an inner surface of the reflective layer, the reflective layer is attached to the reflective surface to cover the patterned light-guiding microstructure, and the light uniform microstructure is disposed on the light output surface of the light-guiding plate. 
     
     
         8 . A light-guiding unit for generating a specific light pattern, comprising:
 a light-guiding plate having two light input surfaces respectively facing two light-emitting modules, a reflective surface connected between the two light input surfaces, and a light output surface opposite to the reflective surface;   a reflective layer disposed on the reflective surface of the light-guiding plate, wherein the reflective layer has a first predetermined reflectance;   a patterned light-guiding microstructure with a predetermined pattern disposed between the reflective surface of the light-guiding plate and the reflective layer, wherein the patterned light-guiding microstructure has a second predetermined reflectance, and the first predetermined reflectance of the reflective layer is different from the second predetermined reflectance of the patterned light-guiding microstructure; and   a light uniform microstructure disposed on the light output surface of the light-guiding plate, wherein the light uniform microstructure is correspondingly opposite to the patterned light-guiding microstructure;   wherein initial light beams generated by the two light-emitting modules are reflected by the patterned light-guiding microstructure to form a projection light source with the specific light pattern passing through the light uniform microstructure, and the specific light pattern of the projection light source is adjustable according to the number of the reflective microparticles.   
     
     
         9 . The light-guiding unit of  claim 8 , wherein the patterned light-guiding microstructure has a plurality of microgrooves parallel to the two light input surfaces or a plurality of quadrangular pyramids arranged as a matrix. 
     
     
         10 . The light-guiding unit of  claim 9 , wherein the patterned light-guiding microstructure with the predetermined pattern is integrally disposed on the reflective surface of the light-guiding plate, and the reflective layer is attached to the reflective surface to cover the patterned light-guiding microstructure. 
     
     
         11 . The light-guiding unit of  claim 9 , wherein the patterned light-guiding microstructure with the predetermined pattern is prefabricated on an inner surface of the reflective layer, and the reflective layer is attached to the reflective surface to cover the patterned light-guiding microstructure. 
     
     
         12 . A light-emitting device for generating a specific light pattern, comprising:
 a heat-dissipating unit including at least one heat-dissipating structure;   a light-emitting unit including at least one light-emitting module detachably disposed on the at least one heat-dissipating structure;   a support unit including a bridge support detachably disposed on the at least one heat-dissipating structure, wherein the bridge support has a retaining groove; and   a light-guiding unit detachably disposed inside the retaining groove of the bridge support, wherein the light-guiding unit includes a light-guiding plate, a reflective layer having a first predetermined reflectance disposed between the light-guiding plate and the bridge support, a patterned light-guiding microstructure with a predetermined pattern having a second predetermined reflectance disposed between the light-guiding plate and the reflective layer, and a light uniform microstructure disposed on the light-guiding plate and correspondingly opposite to the patterned light-guiding microstructure, and the first predetermined reflectance of the reflective layer is different from the second predetermined reflectance of the patterned light-guiding microstructure;   wherein the light-guiding plate includes a light-guiding body, a plurality of reflective microparticles disposed inside the light-guiding body, and a plurality of carrier substances disposed inside the light-guiding body to carry the reflective microparticles to be uniformly diffused inside the light-guiding body, wherein the refractive of the light-guiding body is different from the index refractive index of the reflective microparticle, the viscosity of the carrier substance is smaller than the viscosity of the light-guiding body, and the flowability of the reflective microparticles inside the light-guiding body is increased through the carrier substances.